perio chap 11 & 12
A patient has periodontal disease with moderate plaque biofilm. The hygienist informs the patient that she is going to develop periodontitis if she does not improve her oral self-care. Is the hygienist providing accurate educational advice to the patient?
No, because in most patients with chronic gingivitis never progresses to periodontitis
Periodontitis is associated with high portions of:
gram-negative bacteria
What is believed to play an important role in periodontitis?
gram-negative bacterium
When examining a bacterium under a microscope, you note the following features, a double cell membrane and a red stain. Which type of bacteria are you examining?
gram-negative bacterium
early colonizers of the plaque biofilm are?
gram-positive bacteria
how do bacteria adhere during the process of coaggregation to a tooth surface?
each bacterial stain only has a limited set of bacteria to which it can adhere
the protective factor that can prevent biofilm from being killed with antibiotics, antimicrobials, or the body's immune system is called
extracellular slime layer
Eventually, gingivitis always progresses to periodontitis
false
a biofilm is
a well-organized community pf bacteria
it is difficult to identify specific periodontal pathogens because
-different bacteria in periodontal pockets require different culture media -periodontal pockets contain pathogenic and non-pathogenic bacteria -periodontal disease has episodes of active and dormant disease
A patient refuses to comply with self-care recommendations but is more than willing to have the dental health "do whatever is necessary to keep my mouth healthy". In addition, the patient is a smoker and has a lot of extrinsic stain. How can the dental team help this patient?
-frequent periodontal instrumentation to help disrupt plaque biofilms -inform the patient about the effects of smoking on the periodontium and recommend smoking cessation
what percent of bacteria living on earth live as attached bacteria
99%
what is not classified as a periodontal pathogen capable of colonizing the mouth?
A. odontolyticus
If a bacterium wants to join a biofilm, it should look for what kind of conditions?
a group of bacteria attached to a tooth surface
Periodontitis is
a mixed infection
Your friend May wears contact lenses. In the last few months, Mat has had one eye infection after another. You notice that May doesn't clean her lens case daily. What might be causing Mays eye infections?
a bacterial biofilm might have developed in Mays lens case
what is false about disease progression?
as disease progresses, the bacteria associated with health completely disappear
which of the following characteristics is typical of biofilm?
bacteria communicate with each other by sending out chemical signals
what best describes bacterial blooms?
bacterial bloom is a period in which specific bacterial species grow at rapid rates
Biologic equilibrium in periodontal health means there is a balance between
bacterial plaque biofilms and the host response
what is not true about biofilm?
biofilm form rapidly on any dry surface
Legionnaires disease, which killed 29 people in 1976, was caused by:
biofilm in the hotels air conditioning
the structure of biofilm resembles spiky columns. the bacteria comprising the biofilm are distributed evenly among the spikes.
both statements are false
One human mouth is home to more microorganisms than there are people on planet earth. Periodontal disease is a bacterial infection
both statements are true
The organization of bacteria within biofilms are due to specific associations among bacterial species. The bacteria within a biofilm function together as a system of interdependent parts.
both statements are true
within minutes of a professional prophylaxis, the pellicle attaches to tooth surfaces. within hours of the pellicle formation, bacteria begin to attach to the outer surface.
both statements are true
the cell-to-cell adherence of one oral bacterium to another is termed
coaggregation
the most successful means of destroying plaque biofilm on teeth is
mechanical removal
what is not true about bacteria?
most of the bacteria in a healthy site are very motile
what is NOT true regarding the benefits of daily disruption of plaque biofilms
motile bacteria are important first colonizers of the pellicle
the first bacteria to colonize the tooth surface are
nonpathogenic
the type of bacteria that can cause periodontal disease is referred to as:
pathogenic
what is the term for a bacterial virulence factor that is a class of proteins found in living bacterial cell membranes
peptide proteins
risk factors for periodontal disease other than plaque biofilms do not include
pregnancy
Socranksy grouped microorganisms into complexes and assigned each a color. which color signifies bacterial species that are dominant in the late stages of biofilm development?
red
bacteria can penetrate through epithelium and invade the gingival connective tissue. only gram-negative bacteria have the ability to invade gingival connective tissue.
the first statement is false, the second statement is true
free floating periodontal pathogens can cause periodontal disease. biofilm development always begins supragingivally .
the first statement is false, the second statement is true
A biofilm is a living film that grows on a surface. Biofilms are only found in the mouth.
the first statement is true, the second statement is false
periodontal pathogens can be passed from the oral cavity of one person to another by direct contact. Periodontal pathogens also can be spread by contact with inanimate objects, such as cell phones.
the first statement is true, the second statement is false
Research suggests that this type of bacterial subgingival attachment is the most detrimental to the periodontal tissues
tissue-associated plaque biofilm
